Theo is correct. However in your situation, consider if you plan to build and will be putting an out building within a 100' or so from the pond, then installing an aerator at that time should be sufficient. But if the fishery is of utmost concern as opposed to casual desire, then look into installing 3/4" dia non-potable pipe as an air delivery line for 800' from pump to pond, plus there will be another approx 100' underwater 1/2" pipe.
You can also look at it this way. With no aeration, this causes lower average fish capacity. Lower fish capacity imparts less DO stress to the pond during ice/snow cover. Lower DO stress results in less chance of winter kill. Numerous things affect how much less stress.
Last edited by Bill Cody; 12/24/07 05:10 PM.
